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Cyberpowerpc fan control9/14/2023 So, open your case if you need to so you can see those fans. That kind of control always does this at start-up: start all case fans at full speed immediately, then slow them down after a few seconds to what is required according to temperature. IF the case fans are powered and controlled by the mobo's automatic control system, this little check test can give you some info. Or even, some systems allow the fan controls to deliberately stop the case fans for a cold system, until the system warms up. Another possibility: the fan control system is set to run the fans at too low a speed on a cold system and hence they stall and do not re-start. So NO power connection to that Hub board (if you have this) also can cause this. In some systems, the fans are connected to a fan Hub which, in turn, is powered by a cable to that Hub from the mobo or from the PSU. Fan motor cables NOT connected to anything would do it.
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